What IF means (lg if error)
An lg if error means an LG dryer cannot confirm the lint filter assembly is correctly in place — often because the small magnet that the sensor detects is missing or the filter is not fully assembled. It is usually a quick check of the filter rather than a major repair.
Symptoms to look for
The signs below help confirm you are dealing with this condition rather than a different fault on your LG Dryer. You may see one of them or several together, and they can build up gradually or appear suddenly after a power event, a long door opening, or recent service.
- The display shows “IF”
- The dryer will not start
- The lint filter assembly looks incomplete or misfitted
- The fault appears after cleaning or replacing the filter
Common causes
Several different faults can produce these symptoms. Working through the most likely causes in order helps separate a quick, owner-level check from a problem that needs trained service and the correct LG parts.
- Filter not fully assembled — a two-part filter is not put back together
- Missing filter magnet — the sensor magnet has come off
- Filter not seated — the assembly is not pushed fully home
- Filter sensor fault — the housing sensor misreads
Troubleshooting steps you can try
Work through these checks in order before calling for service. Stop wherever you are unsure, or where high-voltage parts, gas, the sealed refrigeration system, or a heat-pump compressor are involved, and hand the rest to a qualified technician.
- Remove the filter and confirm it is fully assembled with no missing parts.
- Check the small magnet on the filter assembly is present and intact.
- Reseat the assembled filter fully into its housing.
- If IF stays with a complete, correctly seated filter, leave it for service.
Parts a technician may replace
Depending on what the diagnosis shows, a technician may inspect, test, or replace the lint filter assembly, filter magnet, filter sensor, and control board. The correct part for your LG Dryer is matched from the model and serial number, and genuine LG components are fitted rather than generic substitutes so that performance, safety, and the appliance’s long working life are all protected. Confirming the failed part before ordering avoids replacing more than the fault actually requires.
When to call a technician
IF that persists with a complete, seated filter needs a technician to check the filter magnet and housing sensor. When the fix calls for trained service, book a visit through our scheduling page and an experienced, qualified technician will diagnose and repair it. For manufacturer documentation and model lookup, see the manufacturer at lg.com/us.
Prevention and care
Regular care keeps this condition from returning on your LG Dryer. Keep filters, vents, and the condenser or exhaust path clean, avoid overloading or blocking airflow, check that doors and seals close cleanly, and follow the LG maintenance guidance for your model. Because this unit relies on electronic control, protect it with a stable, correctly rated power supply and have any built-in or laundry installation done to LG specification so the control never sees an out-of-range condition. If a code appears, note exactly what was shown before you reset the appliance — that record helps the technician reach an accurate diagnosis and avoid replacing parts unnecessarily.
Related help and LG resources
Browse other LG Dryer diagnostics, read about professional LG Dryer repair, look up your unit in the LG models reference, or the related F0 filter-out error, or schedule a service visit. For LG manufacturer documentation and model lookup, visit the manufacturer at lg.com/us.
